Cap for incandescent lamps.



A. MARIN.

CAP FOR INCANDESCENT LAMPS.

APPLICATION nuao' JULY 8, 1913.

l ml o Patented June 1, 1915.

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Be it known that l, din-ii Marin, ot 35 Avenue des Acacias, Vitry-sur-Seine, geine, in the Republic or" France, have invented a certain new and useful Cap tor lucandea cent Lumps, of which the following is c specification. Y

The caps of incandescent lamps are termed of a metal socket which is closed, on the side away from the hulh lo a dish of insulating material carrying t e contacts against which abut the metallic conductors connected to the lam filament. The preeent practice is to ma e the cop of copper, and the insulating disk of gloss, cast in the base of this cap. From the standpoint of economy it would be advantageous to use ulumuuum in lace of copper tor the sochet oi the cap. Waking the some oil copper expensive because it cannot be shaped in one pass, and the metal has to he'anncaled after each pass; whereas elm-1: on th contrary, enablesthe cap to he shaped without annealing. @wing to its ductility the aluminium may he thinner than the copperwhich moons a saving, Moreover aluminium does not oxidize; it is more sightly; and heing light, is advantageous in respect of carriage and import duty. Nevertheless, aluminium has not.,up to'the pree- 'ent, been used for making the caps ol electric lamps, the reason beingrthat it does not permit the use of the insulating disk of molten glass, the high temperature ot which is injurious to the metal. Attempts have also been made to till up the hottom ot the shaped can by an insulating dish oil percelain; but such porcelain disks are dildcult to fix. 'lhe hoveling or the metal can on to the disk is o tre ucnt cause oi brethage in the latter; end esidee it is impracticahle to obtain these porcelein dishe of perfectly identical dimensions, their method or manufacture goreventin absolute roger larity, and they do not al ow u tiuht joint to he mode with the motel by heveling. ln these conditions the production of the lump cas very dicult.

i he explanation will enahle the edvontages to be appreciated which are ailerded by melting larnn caps in accordance with invention icing the subject oi? the application, said invention comp' 1 f (at Jam; 1 the forming of he caps of aluum, without anneag between the sta ce of the shaping process; (5) the closing out the hyeotnootlon oi? tettero Potent.

lt ntented June 11, 11915.

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lower portion of this motel can by a disk, which is made hetorehond and is not poured like molten gloss, end difilers from the porcelein i inaernuch it oonnot be broken in the operation oil heveling' the metal of the cap, be' made oi strong", unbreakable cardhoerd. Moreover the cardhoard washer is securely attoched to the hose or the aluminiurn ca 9 because while being provided on its outer taco with a circular groove to house the beveled metal of the cap, its inner face is provided with receesee tor receiving the inner ends of the pine or gudgeono which, as in the existing electric lamps, serve to secure the incendeecent lamps in the sockets of the lamp holders,.on the hayonet catch princirole. in conse uence oil this arrangement, the cardboard dish which fills up the metal can, is held securely in the latter and cannot turn in the same during the o oration o'l loevelingr the alinninitnn into t is circular groove on the outer taco of said dish. lt should also he pointed out that this perfectly cylindricul crrdhoard dish produced by punching and stomping, alwoys has the some very regular shape which cannot be obtaincd in the cure porcelain or other cernmic materiel,-

.lhe accompanying thawing illustrates, by way cl exnmple, how this production or": oliurn cope, closed oi; the hose with cnrdhoord, is accomplished in practice.

Figure l is a transverse section of the cap with the removed 2 is side elevntion of the dish. 3 is a bottom plan view of the dish l ig". iis a transverse section oi the dieh. Fig. 5 is a top plan view Oil the dish. l ig. ll is n side view of one of the pins or gudgeons. Fig. l is a view similar to Fig. l, with the diet in place. 8 in a section similar to Fig. 7, the cop being turned through an angle of til".

An aluminium cop n (Fig. ll in shaped in one or more stegee, but without annealing the motel. The gudgoons h, which serve to gudgcons projection; on the inner side or;

the motel oil the c n holding the closing; di

nerve stops for r or cardhonrd fill did

ltlll meats An insulating cardboard disk is shown separately as an outside View, in Fig. 2; as a plan, viewed from above, in Fig. 3; as a section, along the line M M of Fig. 3, in Fig. 4; and as a plan, viewed from below, in Fig. This disk 0 is provided with a circular groove (1 on its outer face, and a slight ridge 6 on the inner face. This ridge 6 is provided with two diametrically opposite recesses f intended to serve as lodgments for the ends of the gudgeons b which project into the interior of the metal cap. Two holes 9 are intended for the passageof the metallic conductors to which the ends of the filament in the bulb are'connected. On its outer face, the disk is provided with two elongated recesses h it, intended to accommodate small metal plates la 70 (see Fig. 8) to which the conductors are soldered. These small contact plates, which serve to transmit the electric current to the lamp filament, are preferably of copper, which metal solders well on to the conductors. These small plates are fitted friction-tight into their recesses by heavy pressure, and, it" necessary, by the aid of some adhesive.

The cap is formed (see Figs. 7 and 8, which shows sections, at right angles to each other, of the finished cap) by inserting the compressed cardboard disk c-which has been produced by known means such as those currently emplo ed in making buttonsin such a way t at the recesses f of the disk tit over the inner ends of the lateral gudgeons b. The collars or disks on said gudgeons are held tight, in their lower portion, between the metal socket and the carbon disk. The outer edge of the metal cap is then beveled into the groove d of the insulating disk, so that this latter is securely held and lixed in the cap, between the outer bezel of metal and the gudgeons t. In this we the finished cap is obtained.

at l claim and desire to secure by Letters Patent is v 1. Caps for incandescent electric lamps, having a shaped socket and an insulating disk formin the bottom of the cap, said insulating disi being of hardened cardboard, said socket being of aluminum,. said metal socket being tightened upon said disk, said disk being provided with diametrically opposite recesses, said cardboard disk allowing the metal of the socket to be tightened upon the disk, the latter being ada ted to maintain its integral form under t e tightening pressure, said socket having gudgeons adapted to fit in said recesses.

2. Caps for incandescent electric lamps, havin ashaped socket and an insulating disk ormin the bottom of the cap, sai insulatin isk being of hardened eardboard, said socket being of aluminum, said metal socket being tightened upon said disk, said disk being provided with diametrically opposite recesses, said cardboard disk allowing the metal of the socket to be tightened upon the disk, the latter being adapted to maintain its integral form under the tightening ressure, said socket having gudgeons a apted to fit in said recesses, said dgeons having collars integral thereon a apted to fit and be held between said socket and disk.

lln witness whereof, T have hereunto signed my name in the presence of two subscribing was:

Witn:

, Gum manta,

Rand BY, 

